The QL48T30 family of low output voltage through-hole
DC-DC converters offers unprecedented performance in
the industry-standard quarter-brick format. This is
accomplished through the use of patent pending circuit
and packaging techniques to achieve ultra-high
efficiency, excellent thermal performance, and a very low
body profile.
Designed specifically to power low voltage silicon de-
vices, the QL48T30 converters provide high-efficiency
single stage conversion directly from a 48 V bus to sub
volt levels, eliminating the need for secondary
conversion. Low body profile and the preclusion of heat
sinks minimize airflow shadowing, thus enhancing
cooling for downstream devices. The use of 100%
surface-mount technologies for assembly, coupled with
Power-One’s advanced electric and thermal circuitry and
packaging, result in products with extremely high quality
and reliability.
QL48T30 Converter
Features
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RoHS lead-free solder and lead-solder-exempted
products are available
Delivers 30 A output
High efficiency
No minimum load required
No heat sink required
Low profile: 0.28” (7.2 mm)
Low weight: 28g (1oz)
Industry-standard footprint: 1.45 “x 2.30”
Meets Basic Insulation requirements of EN60950
Withstands 100 V input transient for 100 ms
On-board LC input filter
Fixed-frequency operation
Fully protected
Remote output sense
Output voltage trim range: ±10%
Output trim via external resistor
High reliability: calculated MTBF 2.6 million hours
per Telcordia TR-332, Method I Case 1
Positive or negative logic ON/OFF option
UL 60950 Recognized in U.S. & Canada, and
DEMKO certified per IEC/EN60950
Meets conducted emissions requirements of FCC
Class B and EN55022 Class B with external filter
Output
Voltage
Efficiency
1
15 A
|
30 A
Load
| Load
Output Current
40ºC
|
70ºC
100 LFM | 100 LFM
1.2 V
1.0 V
0.8 V
82.0%
80.0%
77.0%
81.0%
78.0%
75.5%
1
30.0 A
30.0 A
30.0 A
28.0 A
29.0 A
30.0 A
Vertical orientation, FETs
≤
120°C. Vin=54 V, 25°C, 300 LFM.
Applications
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Telecommunications
Data communications
Wireless
Servers
DSP’s and microprocessors
NOV 13, 2006 revised to MAR 29, 2007
Page 1 of 2
www.power-one.com
QL48T30 Family Data Sheet
36-75 VDC Input; 1.2-0.8 VDC @ 30A Output
Physical Information
Pin Connections
Pin#
Function
1
2
3
4
5
6
7
8
Vin (+)
ON/OFF
Vin (-)
Vout (-)
SENSE(-)
TRIM
SENSE(+)
Vout (+)
1
8
7
2
TOP VIEW
6
5
3
4
SIDE VIEW
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A
ll dimensions are in inches [mm]
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Pins 1-3 and 5-7 are Ø 0.040”[1.02]
with Ø 0.078” [1.98] shoulder
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Pins 4 and 8 are Ø 0.062”[1.02]
without shoulder
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Pin material: Brass
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Pin Finish: Tin/Lead over Nickel
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Module Weight: 1 oz [28g]
Height
Option
A
B
C
D
HT
(Maximum Height)
+0.000 [+0.00]
-0.038 [-0.97]
0.303 [7.69]
0.336 [8.53]
0.500 [12.70]
0.400 [10.16]
CL
(Minimum Clearance)
+0.016 [+0.41]
-0.000 [-0.00]
0.030 [0.77]
0.063 [1.60]
0.227 [5.77]
0.127 [3.23]
Pin
Option
A
B
C
PL
(Pin Length)
±0.005 [±0.13]
0.188 [4.77]
0.145 [3.68]
0.110 [2.79]
Converter Part Numbering Scheme
Product
Series
Input Volt-
age
Mounting
Scheme
Rated Load
Current
Output
Voltage
ON/OFF
Logic
Maximum
Height
Special
Features
QL
Low Voltage
Quarter-Brick
Format
48
36-75 V
T
Through-
hole
30
30 Adc
010
012
⇒
1.2 V
010
⇒
1.0 V
008
⇒
0.8 V
-
P
N
⇒
Negative
P
⇒
Positive
A
A
⇒
0.303”
B
⇒
0.336”
C
⇒
0.500”
D
⇒
0.400”
The example describes P/N QL48T30010-PA: 48 V input, through-hole mounting, 30 A @ 1.0 V output, positive ON/OFF logic, and a maximum height of 0.303”.
RoHS Ordering Information:
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No RoHS suffix character is required for lead-solder-exemption compliance.
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For RoHS compliance to all six substances, add the letter "G" as the last letter of the part number.
Models highlighted in yellow or shaded are not recommended for new designs.
NUCLEAR AND MEDICAL APPLICATIONS - Power-One products are not designed, intended for use in, or authorized for use as components in life support
systems, equipment used in hazardous environments, or nuclear control systems without the express written consent of the respective divisional president of
Power-One, Inc.
TECHNICAL REVISIONS - The appearance of products, including safety agency certifications pictured on labels, may change depending on the date
manufactured. Specifications are subject to change without notice.
